"Mark is a sportsman, a realist, and he knows the numbers better than anybody else. He is realistic enough to know things can change very quickly, but he is in a great position.

"If we come through Monza [Italian Grand Prix on September 12] then we will be heading to tracks we know will suit our package.

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Highlights - Hamilton wins in Belgium

"Clearly Mark is in the form of his career, and based on the season to date he looks in great shape, but it would be a foolish person to rule out Sebastian at the moment."

The issue of favouritism within the Red Bull outfit has been a contentious issue this season.

In Turkey, after Vettel crashed into Webber to gift a one-two to McLaren, Red Bull seemed to blame the Australian when most pundits believed the German driver was at fault.

And at the British Grand Prix back in July, Webber was unhappy that Red Bull controversially took off their only new wing from his car in order to give it to Vettel.

Horner denied that decision meant that Vettel was the preferred driver but when Webber subsequently won at Silverstone he pointedly remarked over the team radio: "Not bad for a number two driver."

After the Belgian GP, Hamilton said McLaren would not be considering favouring himself over team-mate Button, who failed to score a point after the Vettel incident.

"I get the same treatment as Jenson, and that enables us both to score maximum points, so I don't think there should be any preferential treatment," said Hamilton.

Either way, Red Bull will be determined to avoid any possible accusations of implementing team orders, which are illegal.

Ferrari were widely castigated after ordering Felipe Massa to allow Fernando Alonso to pass him during the German Grand Prix, and could face a points penalty when the incident is discussed by the World Motorsport Council before the Italian Grand Prix in two weeks time.

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